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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9c697b635fb28451bffd217181fd99fc167e9963a28aca3323085ea7c07cad' 
  AND token = 'f+jfZNvq/5SwR+7nwak6lufptUAAxmKRB4ns6dc/v14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}